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4.4.2.1
PSI5 Initialization Phase 2 (10-Bit Mode)
In PSI5 initialization phase 2, 10-bit mode, the device transmits a sequence of sensor specific configuration and serial number
information. The transmission data is in conformance with the PSI5 specification, Revision 1.3 and AKLV27, Revision 1.10. The
data content and transmission format is shown in Table 9 and Table 10 . Table 9 shows the 10-bit phase 2 timing for different op-
erating modes. Times are calculated using the equation in Section 4.4.2 .
Table 9. Initialization Phase 2 Time (10-Bit Mode)
Operating Mode
Asynchronous Mode (228 μ s)
Synchronous Mode (500 μ s)
Repetition Rate (k)
8
4
# of Transmissions
512
256
Nominal Phase 2 Time
116.7 ms
128.0 ms
Table 10. PSI5 Initialization Phase 2 Data (10-Bit Mode)
PSI5 V1.2 PSI5 V1.2
Field ID # Nibble ID #
Page
Address
PSI5 Nibble
Address
Register Address
Description
Value
F1
F2
F3
F4
D1
D2, D3
D4, D5
D6, D7
0000
0001, 0010
0011, 0100
0101, 0110
Hard-coded
Hard-coded
MFG_ID[7:0]
Hard-coded
Protocol Revision = V1.3
Number of Data Blocks = 32
Manufacturer ID
Sensor Type = Acceleration (high-g)
0100
0010 0000
User
0000 0001
U_DIR[1:0] = 00: 0000
D8
0111
U_DIR[1:0] = 01: 0100
U_DIR[1:0] = 10: 1000
Axis
User
F5
U_DIR[1:0] = 11: 1100 (not used)
±60g: 0111
D9
0
1000
±120g: 1000
±240g: 1001
Range
Varies
±480g: 1010
F6
F7
F8
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
1001
1010
1011
1100
1101
1110
1111
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
DEVCFG2[7:4]
DEVCFG2[3:0]
Hard-coded
Hard-coded
DEVCFG6[3:0]
DEVCFG7[7:0], DEVCFG8[4:0]
converted to
Binary coded Julian Date
Reference Section 3.1.5.5
SN0 (High Nibble)
SN0 (Low Nibble)
SN1 (High Nibble)
SN1 (Low Nibble)
SN2 (High Nibble)
SN2 (Low Nibble)
SN3 (High Nibble)
SN3 (Low Nibble)
Sensor Specific Information
Sensor Specific Information
Product Revision
Product Revision
Product Revision
JY[6:3]
JY[2:0], JM[3]
JM[2:0], JD[1]
JD[3:0]
MMA52xx Serial Number
MMA52xx Serial Number
MMA52xx Serial Number
MMA52xx Serial Number
MMA52xx Serial Number
MMA52xx Serial Number
MMA52xx Serial Number
MMA52xx Serial Number
User
User
Factory
Factory
User
User
User
User
User
Factory
Factory
Factory
Factory
Factory
Factory
Factory
Factory
F9
D27
D28
D29
D30
D31
D32
1
1010
1011
1100
1101
1110
1111
Initial Raw Offset (Offset[3:0])
Initial Raw Offset (Offset7:4])
([AvgSelfTest[1:0],Offset[9:8]])
Average Self-Test
(AvgSelfTest[5:2])
Average Self-Test
(AvgSelfTest[9:6])
DEVCFG1 [7:4]
Raw Offset 1
(If INIT2_EXT=1, ‘0000’ otherwise)
Raw Offset 1
(If INIT2_EXT=1, ‘0000’ otherwise)
Raw Off/Avg ST 1
(If INIT2_EXT=1, ‘0000’ otherwise)
Avg Self-Test 1
(If INIT2_EXT=1, ‘0000’ otherwise)
Avg Self-Test 1
(If INIT2_EXT=1, ‘0000’ otherwise)
Sensor Specific
(If INIT2_EXT=1, ‘0000’ otherwise)
Varies
Varies
Varies
Varies
Varies
0010
1.
Offset and average self-test data will only be transmitted with sync pulse periods that guarantee the self-test phase1 and phase 2 will be complete prior to
required transmission. If sync pulse periods faster than this are used, ‘0’s will be transmitted instead of offset and/or average self-test data.
MMA52xxKW
Sensors
40
Freescale Semiconductor, Inc.
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